|
|
/*
|
|
|
This is java program to generate the random numbers. In mathematics, the middle-square method is a method of generating ‘pseudorandom’ numbers.To generate a sequence of 4-digit pseudorandom numbers, a 4-digit starting value is created and squared, producing an 8-digit number (if the result is less than 8 digits, leading zeroes are added to compensate). The middle 4 digits of the result would be the next number in the sequence, and returned as the result. This process is then repeated to generate more numbers.
|
|
|
*/
|
|
|
|
|
|
//This is a sample program to generate random numbers using the middle square method
|
|
|
import java.util.Random;
|
|
|
import java.util.Scanner;
|
|
|
|
|
|
|
|
|
public class Middle_Suqare_Method
|
|
|
{
|
|
|
static int a[] = {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000};
|
|
|
static int middleSquareNumber(int numb, int dig)
|
|
|
{
|
|
|
int sqn = numb*numb, next_num=0;
|
|
|
int trim = (dig/2);
|
|
|
sqn = sqn / a[trim];
|
|
|
for(int i=0; i<dig; i++)
|
|
|
{
|
|
|
next_num += (sqn%(a[trim]))*(a[i]);
|
|
|
sqn = sqn/10;
|
|
|
}
|
|
|
return next_num;
|
|
|
}
|
|
|
public static void main(String args[])
|
|
|
{
|
|
|
System.out.println("Enter the #-digit random numbers you want: ");
|
|
|
Scanner sc = new Scanner(System.in);
|
|
|
int n = sc.nextInt();
|
|
|
int start=1, end=1;
|
|
|
start = a[n-1];
|
|
|
end = a[n];
|
|
|
Random rand = new Random();
|
|
|
int number = rand.nextInt(end-start)+start;
|
|
|
System.out.print("The random numbers are:\n" +number+", ");
|
|
|
int new_number=0;
|
|
|
for(int i=0; i<9; i++)
|
|
|
{
|
|
|
number = Middle_Suqare_Method.middleSquareNumber(number, n);
|
|
|
System.out.print(number+", ");
|
|
|
}
|
|
|
System.out.print("...");
|
|
|
sc.close();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/*
|
|
|
Enter the #-digit random numbers you want:
|
|
|
2
|
|
|
The random numbers are:
|
|
|
89, 92, 46, 11, 12, 14, 19, 36, 29, 84, ...
|